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| author |   Tejun Heo <htejun@gmail.com> | 2007-10-31 10:17:04 +0900 |
|---|---|---|
| committer |   Jeff Garzik <jeff@garzik.org> | 2007-11-03 08:46:54 -0400 |
| commit | 08cf69d005acda706bc014c61301993758ce9c5f (patch) | |
| tree | a7254a45b25ea52bc77a3340650a9b45386f1650 /drivers/ata | |
| parent | libata: cosmetic clean up / reorganization of ata_eh_reset() (diff) | |
| download | linux-dev-08cf69d005acda706bc014c61301993758ce9c5f.tar.xz linux-dev-08cf69d005acda706bc014c61301993758ce9c5f.zip | |
libata: more robust reset failure handling
Reset failure is a critical error. It results in disabling the link
requiring user intervention to re-enable it. Make reset failure
handling more robust such that libata EH doesn't give up too early.
* Temporary glitches during hardreset may lead to classification
failure when there's no softreset available. Retry instead of
giving up.
* Initial softreset or follow up softreset may fail classification.
Move classification error handling block out of followup softreset
block such that both cases are handled and retry instead of giving
up. Also, on the last try, give ATA class a blind shot.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libata-eh.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index dae2174f3877..7a2e54e92164 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -2184,25 +2184,32 @@ int ata_eh_reset(struct ata_link *link, int classify, "follow-up softreset required " "but no softreset avaliable\n"); rc = -EINVAL; - goto out; + goto fail; } ata_eh_about_to_do(link, NULL, ATA_EH_RESET_MASK); rc = ata_do_reset(link, reset, classes, deadline); - - if (rc == 0 && classify && classes[0] == ATA_DEV_UNKNOWN && - !(lflags & ATA_LFLAG_ASSUME_CLASS)) { - ata_link_printk(link, KERN_ERR, - "classification failed\n"); - rc = -EINVAL; - goto out; - } } /* -EAGAIN can happen if we skipped followup SRST */ if (rc && rc != -EAGAIN) goto fail; + /* was classification successful? */ + if (classify && classes[0] == ATA_DEV_UNKNOWN && + !(lflags & ATA_LFLAG_ASSUME_CLASS)) { + if (try < max_tries) { + ata_link_printk(link, KERN_WARNING, + "classification failed\n"); + rc = -EINVAL; + goto fail; + } + + ata_link_printk(link, KERN_WARNING, + "classfication failed, assuming ATA\n"); + lflags |= ATA_LFLAG_ASSUME_ATA; + } + ata_link_for_each_dev(dev, link) { /* After the reset, the device state is PIO 0 and the * controller state is undefined. Reset also wakes up |